 /*******************************************************************************
  * Copyright (c) 2000, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.internal.indexing;

 interface Referable {

     /**
      * Adds a reference for this entity to track. Returns the current count.
      */
     int addReference();

     /**
      * Tests for existing references.
      */
     boolean hasReferences();

     /**
      * Removes a reference. Returns the current count.
      */
     int removeReference();

 }

